The Mediatrix 3500 Series gateways meet the requirements of enterprises that want to connect their ISDN equipment, such as PBXs, through a T1 PRI interface to an IP network or as a gateway to the PSTN.

The Digium G400 is a higher density four (4) port gateway appliance designed to
connect legacy voice technologies (T1/E1/PRI) to VoIP as well as
transcoding SIP protocols between VoIP devices and/or service providers.